Marwood john oliver



Patented Dec. 6, |898.

M. J. OLIVER.

SAFETY LIFT.

(Application led Sept. 9` 1897.)

2 Sheets-Sheet l.

(No Model.)

Patented Doc. 6, |898'.

2 Sheets-Sheet 2.

I 'I 4tum' A A Rn s PETERS co, moro-urne., msmucn'ou4 o. c.

UNITED STATES PATENT OFFICE.v

.MARVVOOD JOHN OLIVER, OF ST. TUDY, ENGLAND.

SAFETY-MFT.

SPECIFICATION forming part of Letters Patent N o. 615,362, dated December 6, 1898.

l Application led September 9,1897. Serial No. 651,155. (No model.)

To all whom t may concern,.-

Be it known that LMARWOOD JOHN OLIVER, a subject of the Queen of Great Britain, and a resident of St. Tudy, in the county of Cornwall, England, have ,invented certain new and useful Improvements in Safety-Lifts, (for which I have obtained a patent in Great Britain, No. 11,677, dated May 29, 1896,) of which the following is a full, clear, and exact speciiication thereof.

This invention relates to improvements in safety appliances for lifts and the like, the object being to provide an arrangement by means of which in the event of the supporting rope, chain, cable, or the like breaking the lift or the like is prevented from falling.

In order that my invention may be fully understood, I will now refer to the annexed drawings, in which- Figure 1 is a section of the side elevation of my invention; Fig. 2, a plan view of same.

a is the cage, to which the bars b are hinged at c and which bear upon the upright bar d, e being a spring which helps to maintain the bars b in position, the dotted lines indicating the positions of the bars b when the cage a is suspended for traveling.

f is a bar having the friction-rollers i, which bear upon the bars b, this bar f being secured to the upright d, which has the stop-piece g for preventing same from passing through the cage farther than the position shown by the dotted lines. It will be seen that in the ordinary working position of the cage the ends 7L of the bars l) will not engagein the indentations on the racks j; but in the event of the suspending rope or chain k breaking the action of the springs e Will cause the ends of the bars b to engage on the racks j, thus preventing the descent of the cage. These racks j are supported at intervals upon springs or buffers Z for the purpose of preventing concussion in the event of the rope or chain 7.: breaking, as this concussion has been found to be very objectionable, the racks j being formed in the required number of sections.

Having thus described my invention, what I claim, and desire to obtain by Letters Patent, is-

In a safety device for lifts the combination with the hoisting-rope, of the cage, bars hinged to said cage, racks made in sections and springs interposed between the sections, and means whereby the hinged bars are made to engage said racks when the hoisting-rope is broken substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 22d day of March, 1897.

MARWOOD JOHN OLIVER.

Witnesses:

H. DRURY BAKER, W. D. PEYNNE. 

